html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

#map-1, #map-2, #tools-1, #tools-2 {
    height: 50%;
    width: 50%;
    position: absolute;
}
#map-1 {
    top: 0;
    left: 0;
}
#map-2 {
    bottom: 0;
    right: 0;
}
#tools-1 {
    top: 0;
    right: 0;
    background-color: #ccccff;
}
#tools-2 {
    bottom: 0;
    left: 0;
    background-color: #ffcccc;
}
